You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Edward Thompson, can you help me booking flight on 03/11?

ASSISTANT: Sure, can you please help me with the airport codes?

USER: My travelling airport codes are SFO to HOU.

ASSISTANT: Could you please help me with the return date?

USER: I would like to return on 03/13.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, I will wait for your reply.

ASSISTANT: Edward, I am sorry to inform you that there is no flight available at your requested dates.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for contacting us.