You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to attend a comic con in Houston, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, can you please share me your airport codes?

USER: Sure, I want to start my journey from SFO to reach IAD.

ASSISTANT: May I know your planned travel dates?

USER: 03/04 and 03/06 are my planned travelling dates.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: Can I know your name?

USER: I am Robert Edwards.

ASSISTANT: We did find any flight on your matching information.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you.