You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency.

USER: My name is Samuel King.

ASSISTANT: Samuel, how can I assist you today?

USER: There is a meeting in Houston-HOU with my client, so I want to book a ticket from Philadelphia-PHL.

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My departure date is on 05/14 and return on 05/16.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok.

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

USER: It's ok, I will check for other alternative. Thanks for your information.

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