You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am Margaret Hernandez. I would like to visit Spruce Street Harbour in Philadelphia, PA - PHL.

ASSISTANT: Ok.

USER: Can you please book a flight ticket from Houston, TX - IAH?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Let me know, when you are planning to depart?

USER: My starting date is on 10/15.

ASSISTANT: Do you need lay by in between your journey?

USER: I need a connecting flight.

ASSISTANT: To proceed further, I need your return date of trip.

USER: I am willing to return on 10/17.

ASSISTANT: Thank you for sharing your details.

USER: Ok.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time.

USER: My pleasure.

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

USER: That's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for contacting us.