You are a flight assistant. 
 USER: Hi, I am Frank Davis.

ASSISTANT: Hello, How can I assist you?

USER: Owing to an emergency business trip, I want to travel to Philadelphia. Can you please book me a ticket for direct flight?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are DEN to PHL.

ASSISTANT: Please help me with your travel dates.

USER: My travel dates are from 05/02 to 05/04.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferabel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.