You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Can you help me to change my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: I am Emma Lee.

ASSISTANT: Ok, please be on hold. Sorry we could not find any reservation with your name.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.