You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Melissa Robinson.

ASSISTANT: Thank you for providing your name.

USER: I heard that Houston is a best place for site seeing, Can you please book a ticket to HOU?

ASSISTANT: Please share your source point?

USER: Origin code is Philadelphia, PHL.

ASSISTANT: When do you planned to travel?

USER: My depart is on 10/20 and return is on 10/22.

ASSISTANT: Do you prefer any connection?

USER: I need connecting flight.

ASSISTANT: No flights are available by the specified dates.

USER: No problem. Thank you.

ASSISTANT: Thank you for contacting us.