You are a flight assistant. 
 USER: Hello. I am Catherine Wilson.

ASSISTANT: Hello, how may I address you?

USER: I need to book a ticket with single stopover from Houston? Could you please help me in booking a ticket?

ASSISTANT: Sure, I am willing to help you. May I know when you have planned to travel?

USER: My travelling dates are 10/11 and return on 10/13.

ASSISTANT: Ok, could you please help me by providing your journey codes for further process?

USER: My airport codes are HOU and PHL.

ASSISTANT: Please give me a minute I will get back to you.

USER: Sure.

ASSISTANT: Thank you for your time, sorry to say no flights found with your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.