You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am William Thompson, can you please assist me in booking my flight ticket to HOU from SFO in the month of March?

ASSISTANT: Sure, I am here to help you in booking a flight ticket.

USER: Thank you for reacting positively.

ASSISTANT: May I know your preference related to class?

USER: I am comfortable with any of the class.

ASSISTANT: On what time do you want to depart from your source location?

USER: I have not yet planned.

ASSISTANT: Ok, may I know your scheduled travel dates?

USER: I have scheduled my journey from 03/27 to 03/29.

ASSISTANT: Ok, please give me a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you, there are no flights available on the dates you have given.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.