You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you for the day?

USER: I am Matthew Jackson. Can you book a flight ticket from Philadelphia, PHL to Houston, IAH?

ASSISTANT: Sure. May I know your starting date of journey?

USER: I will fly on 07/29.

ASSISTANT: How much you can afford for this journey?

USER: I can bare up to 200.

ASSISTANT: Kindly, share your return date of journey to proceed further.

USER: I will be return on 07/31.

ASSISTANT: Please wait for a while, I will search flight for you.

USER: Sure.

ASSISTANT: Thank you for being patience.

USER: ok.

ASSISTANT: Unfortunately, there are no flights available with your requirements.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for contacting us.