You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: As my trip to Austin got postponed as of now, can you please help me in changing my existing reservation?

ASSISTANT: Sure, May I know your name?

USER: I am Sarah Wright.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for opting us.