You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am David Rodriguez. Can you please reserve me a flight ticket which is having it's depart time in the morning?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I have planned to travel on July 28th and return on July 30th.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: Yes, I prefer connecting flight.

ASSISTANT: May I know your airport codes?

USER: I would like to travel from DFW to PHL.

ASSISTANT: Is there any specifications?

USER: No.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.