You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am William Lee, can you help me to book a flight from MSP to EWR?

ASSISTANT: Sure, can I know the travel dates please?

USER: My journey dates are 03/23 and 03/25.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for approaching us.