You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

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

ASSISTANT: Sure, I can help you. May I know your name?

USER: I am Melissa Martinez.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting, We didn't found any reservation by this name.

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

ASSISTANT: Thank you for reaching us.