You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER:  Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you. May I know your name to check with existing reservation?

USER: Jerry Garcia here.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: Not a big deal. Thank you.

ASSISTANT: Thank you for choosing us.