You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my current reservation due to urgent meeting, can you help me with that?

ASSISTANT: Sure, I can do that for you. May I know your name?

USER: I am Jennifer Davis.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: That's ok. Thank you for your service.

ASSISTANT: You are welcome and thank you for contacting us.