You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Rachel Scott here.

ASSISTANT: How may I aid you?

USER: I would like to change my existing reservation, because while booking I gave wrong airport codes, so can you help me for this?

ASSISTANT: Ok, I can help you with that. Please wait a moment, I will get back with previous reservation status.

USER: Ok, I will wait for your response.

ASSISTANT: Ok, thanks for your time but there is no reservation under your name.

USER: Oh! it is ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Most welcome, thank you for helping me.