You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I please know your name?

USER: Andrew Davis here.

ASSISTANT: Is there anything specific that you would like me to help you with?

USER: I am very excited as this trip is very special to me, I am going to hangout with my school friends after a long time.Can you please reserve a ticket from IAD to DFW?

ASSISTANT: Sure, can you please give me your planning dates?

USER: My planning dates are 05/22 and 05/24.

ASSISTANT: Sure, give me a minute.

USER: Sure.

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

USER: It's alright, we can plan our trip in next few days.

ASSISTANT: Thank you for taking time to speak with me.

USER: Thank you for searching the flights and quick response.