You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Gonzalez.

ASSISTANT: How may I guide you today?

USER: I need to meet my childhood friend in Philadelphia after many years. Can you help me in booking a ticket?

ASSISTANT: Sure, I will help you with that, Charles. Can you please share on what dates you are planning to travel?

USER: I would like to travel on 04/12 and 04/14.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a direct flight. Please check for that.

ASSISTANT: I would like to know your source and destination airport codes to proceed further?

USER: I want to travel from CLT to PHL.

ASSISTANT: Please wait for a while, I will get back with your flight details.

USER: Sure, take your own time.

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

USER: That is not a problem.

ASSISTANT: Thank you for reaching us.

USER: I will try to reach there in another way. Thank you for helping me.

ASSISTANT: Have a great day.