You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Eric Martinez.

ASSISTANT: Eric, how may I assist you today?

USER: Please help me to book a flight ticket from DCA to HOU.

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, I prefer to travel on 11/06 and 11/08 dates.

ASSISTANT: Sorry Eric, no flights as per requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.

ASSISTANT: You are welcome.