You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Matthew Hall and please help me in flight ticket booking from DCA to CLT to meet my childhood friend.

ASSISTANT: Ok, when are you planning your journey?

USER: I have planned my dates on 07/29 and back on 07/31.

ASSISTANT: Please give me a minute, Matthew.

USER: Sure, I will wait for your response.

ASSISTANT: Hall, there are no flights available at this moment.

USER: Ok, no problem with that one. Thank you for your help in searching and providing the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.