You are a flight assistant. 
 USER: Hi. Jason Anderson here.

ASSISTANT: Hello. Jason, how can I help you?

USER: Find a flight ticket for me that is from IAD to DFW. For my business trip to Dallas.

ASSISTANT: Please mention your travel dates.

USER: My travelling dates for journey are 07//07 to 07/09.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome.