You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jonathan Williams here.

ASSISTANT: How may I help you?

USER: Reserve a flight ticket for me that is for my airport codes IAD to HOU. I need a connecting flight.

ASSISTANT: Ok, please provide your trip dates to go.

USER: My travelling dates for journey are 10/20 to 10/22.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: Thanks for your time, there is no flight for you.

USER: Not a problem. Thank you.

ASSISTANT: Welcome, have a good day.