You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to book a flight ticket from MSP to PHL, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Katherine Taylor.

ASSISTANT: Can you share me your trip dates please?

USER: My travel dates are 05/21 and 05/23.

ASSISTANT: Is there any airline preference?

USER: I want to travel in a big airlines with normal cost.

ASSISTANT: Sure, may I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your departure and arrival timings?

USER: I do not have any particular timings.

ASSISTANT: Do you have any other specifications?

USER: No. Thank you for asking.

ASSISTANT: Ok, please give me a minute to check the flights with your requirements.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights found with your requirements.

USER: Ok, no issues. Thank you for your service.