You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you need from us?

USER: Suddenly I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the details?

ASSISTANT: Oh! Sure, I can assist you with changing the details once I have found your reservation.

USER: Thank you for accepting my request.

ASSISTANT: Ok, can you please tell me the name on which you have reserved your previous ticket?

USER: Sure, I have reserved the ticket under my name of Thomas Lopez. So, you can check with this name.

ASSISTANT: Ok. I will put the conversation on hold for a while, is it ok for you?

USER: Sure, I will wait your response.

ASSISTANT: I am really sorry to inform you, when I have checked your ticket status in the confirmation chart list, I haven't found your name in that list.

USER: It's ok fine, no problem. Anyway, thank you for your time.

ASSISTANT: You are welcome. Thank you for choosing your travel agency.