You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Joseph Thomas.

ASSISTANT: Nice to meet you Joseph.

USER: Can you help me in booking from DCA to DTW, as there is a family function at Detroit?

ASSISTANT: Sure, tell me your travel dates please?

USER: My journey dates are 06/21 to 06/23.

ASSISTANT: Thanks for your time Joseph.

USER: Ok.

ASSISTANT: But I am sorry to say that there are no flights found with your flight details.

USER: No issue, thank you.

ASSISTANT: Thank you.