You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Martinez.

ASSISTANT: How may I aid you today?

USER: Due to change in the climatic conditions at my visiting place, I would like to change my existing reservation to Dallas. Will you help me with this?

ASSISTANT: Sure, I'm glad to help you. Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Michelle, there is no reservation found under your name to do changes in that.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a great day.