You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have booked a flight ticket in the last week but now the meeting was postponed. So, I just want to change the travel dates. Can you please help me to do that?

ASSISTANT: Sure, I can help you and can I know your name for checking your previous flight ticket booking in our portal?

USER: Myself Benjamin Walker.

ASSISTANT: Please give me a moment to search your flight ticket booking in our previous list and I will get back to you about the information.

USER: Ok, I will wait for that.

ASSISTANT: Thank you for being on hold, I have searched with your name in our search bar but is is displayed that there is no user present in the list.

USER: Ok, not a problem. Thank you so much.

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