You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Perez.

ASSISTANT: How can I help you?

USER: I need to change my trip dates as my appointment to consult my doctor got postponed. Can you help me?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure, I will.

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

USER: Ok fine, thanks for checking.

ASSISTANT: Thank you for approaching us.