You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Charles Miller from Houston. I need your help in booking of a flight ticket from IAH to DFW for an important business meeting. Can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure Miller, can you please share me with your dates of travel?

USER: Thank you for your positive response, I want to take off on 11/25 and please book my return ticket also on 11/27.

ASSISTANT: Please wait for a moment to check for the availability.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry Miller, there is no flight found as per your travelling details.

USER: Oh! So sad to hear that. It's ok I will contact another airline agency. Thank you for your information.

ASSISTANT: You are welcome always.