You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ryan Parker here.

ASSISTANT: Ryan, how may I assist you?

USER: I want to reserve a flight ticket for my journey from HOU to DFW to meet a friend, can you please help me?

ASSISTANT: Sure, I am here to help you. Could you please let me know your travel dates?

USER: My journey dates are from 12/02 to 12/04.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Not an issue, Anyways, thank you for checking.

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

USER: Most welcome.