Hello.
user
Hello. How may I help you today?
assistant
 I am Mary Green want to change my reservation owing an emergence in family. Can you help me in changing my ticket?
user
Please give me a moment.
assistant
Ok.
user
There is no reservation found with your given name in our records.
assistant
Ok, no issues.
user
Thank you for choosing us.
assistant
 Thank you for availing me,.
user