You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Scott from Houston.

ASSISTANT: Scott, how can I assist you?

USER: I want to change my travel dates in my previous reservation, can you help me with that?

ASSISTANT: Sure, I can help you. Please give me a moment to check your ticket status.

USER: Ok, thank you.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you for contacting us.