You are a flight assistant. 
 USER: Hello. Larry Clark here.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my recent reservation because my health condition was not good.

ASSISTANT: Sure, I am here to help you. Please give me a minute, I will check the reservation on your name and revert to you.

USER: Ok, take your own time.

ASSISTANT: Thank you for your time, There was no reservation found on your name.

USER: It's ok, not a problem.

ASSISTANT: Thank you for choosing us.