You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Paul Brown.

ASSISTANT: How can I assist you?

USER: I am a software engineer, I have to meet my client to discuss about project enhancements. Could you book my ticket from EWR to OAK?

ASSISTANT: Sure Brown, can you please let me know on which dates are you planning your journey?

USER: Ok, my itinerary dates are from 03/24 to 03/26.

ASSISTANT: That's fine, please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Brown, sorry to inform you that there are no flights available for you on those dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.