You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jonathan Hill.

ASSISTANT: How may I help you?

USER: I am looking for a direct flight to Houston. Can you help me in booking a ticket?

ASSISTANT: Please share your airport codes.

USER: I would like to travel from IAD to HOU.

ASSISTANT: Can you please provide me your travel dates?

USER: The journey dates are 10/14 and 10/16.

ASSISTANT: Please wait a  minute.

USER: Sure, take your time.

ASSISTANT: Sorry Hill, no flight is available for you.

USER: Its ok, thank you for the information.

ASSISTANT: Welcome, have a nice day.