You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed. Please help me in this?

ASSISTANT: Sure, please share your good name?

USER: Sure, my name is Alexander Scott.

ASSISTANT: Please wait for a while.

USER: Ok,.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for choosing us.