You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Michael Allen. I want to meet my client as he is unwell, can you please help me to book my flight ticket?

ASSISTANT: Sure, I can help you and can you please mention your departure and arrival dates of your journey?

USER: Sure, I will depart on Oct 27th and I will return back on Oct 29th.

ASSISTANT: Can you please confirm your airport codes?

USER: I want to travel from IAH to BOS.

ASSISTANT: Do you want any halt in between your journey?

USER: I prefer for a direct flight.

ASSISTANT:  Sure, is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: Yes, I prefer to depart in the evening.

ASSISTANT: Sorry, there is no flight found with your requirement.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.